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Expresso takes a simple musical expression (literally "X") and mutates it.
In each generation, transformations are applied to
components of the expression. This is a fractal technique known as an
L-system.
The more generations there are, the larger and
more complex the expression gets (and the longer it can take
to compute).
The output varies wildly, from boring to fascinating.
Press "Mutate" a few times
till you get something that looks interesting, then click
on the image to play it. See Composer's Quarry for examples of output.
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After 19 generations the expression "X" became this: | ((transpose((transpose(shuffle(transpose(transpose(step(X,12) ,4) ,-7) ) ,4) +transpose(transpose(((((echo(shuffle((X+step(X,12) ) ) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) +transpose(((transpose((transpose(X,-5) |transpose(X,4) ) ,-5) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) ,12) ) |(echo((X|X) ,4,6) |transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,-7) ) ) ,7) ) +transpose(transpose(transpose(echo(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4,6) ,4) ,4) ,7) ) +transpose(transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-5) ,-7) ) ,-5) ,12) ) ,4) +(echo((((echo(((arpeggio(step((X|X) ,12) ) +transpose(transpose((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(((arpeggio(step((X+X) ,12) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((((X+X) +transpose(X,12) ) |transpose((X+transpose(X,7) ) ,-7) ) |echo((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) ,12) ) ,12) ) ,4,6) +transpose(transpose(transpose(shuffle((arpeggio(X) +((X+X) |echo(X,4,6) ) ) ) ,-5) ,-7) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,4) ,-7) ) +transpose((echo((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) +transpose((transpose(transpose(X,4) ,4) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4,6) +transpose((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose((X+(X+transpose(X,12) ) ) ,-5) ,7) ) ,12) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((transpose((X|X) ,-5) +transpose((transpose(X,-5) +transpose(X,7) ) ,-5) ) ,4) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose(step(transpose(((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) |shuffle(transpose((X+X) ,-7) ) ) ,-5) ,12) ,-5) ,4) ,12) ) ,4,6) |step(shuffle(step(((((echo(transpose((X+transpose(step(X,12) ,7) ) ,4) ,4,6) +transpose((((echo(X,4,6) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,4) ) +transpose(((X+transpose(X,12) ) |((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +echo(transpose(transpose(X,4) ,-7) ,4,6) ) ,4) ) +transpose((transpose(shuffle((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) |((transpose(transpose(arpeggio(X) ,4) ,-5) +shuffle(transpose(X,4) ) ) |(X|X) ) ) ,7) ) +(transpose(((transpose(transpose(X,4) ,-7) |shuffle((X+X) ) ) |transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,-5) ) ,-5) +transpose(((transpose(step(X,12) ,-7) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose((transpose(shuffle((X+transpose(X,7) ) ) ,-7) +transpose(arpeggio(step((X+transpose(X,7) ) ,12) ) ,12) ) ,7) ) ,7) ) ) +transpose(transpose(shuffle((((((transpose(X,-7) +transpose(X,12) ) +transpose(echo((X|step(X,12) ) ,4,6) ,12) ) +transpose(((transpose(X,4) +transpose(transpose(X,4) ,7) ) |(shuffle(X) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +(transpose(echo(X,4,6) ,-5) +transpose(step(echo(X,4,6) ,12) ,7) ) ) +transpose(transpose(step(transpose(transpose(X,4) ,4) ,12) ,4) ,12) ) ) ,-7) ,7) ) ,12) ) ,12) ) ) +transpose((transpose(transpose(transpose(((transpose(((transpose(shuffle(transpose((X|(X+X) ) ,-5) ) ,-5) +transpose(transpose(transpose(arpeggio(arpeggio(step(X,12) ) ) ,-5) ,4) ,4) ) +transpose(echo(arpeggio(shuffle(X) ) ,4,6) ,7) ) ,-5) +transpose((step(((step(arpeggio(X) ,12) +transpose((X+arpeggio(X) ) ,12) ) |step(transpose(transpose(transpose(X,-5) ,4) ,-5) ,12) ) ,12) +transpose(((((X+transpose(X,12) ) |transpose(X,-7) ) |echo((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) +((X+X) +X) ) ,12) ) ,7) ) |((arpeggio(transpose((((X+transpose((X|((X+X) +(X+transpose(X,7) ) ) ) ,12) ) +transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,-5) ,4) ) +transpose(X,7) ) ,4) ) +echo(echo(((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,12) ) ,-5) ) ,4,6) ,4,6) ) +transpose(step(transpose((X|((X+transpose((X+transpose(X,7) ) ,12) ) +((X+transpose(X,7) ) +transpose((X|X) ,12) ) ) ) ,4) ,12) ,12) ) ) ,4) ,4) ,4) +transpose(((((((((transpose(transpose(echo(X,4,6) ,4) ,-5) +transpose((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose((echo(transpose(transpose(X,-5) ,-5) ,4,6) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,7) ) ,7) ) +transpose(transpose(transpose((transpose(X,-5) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) ,-5) ,-5) ,12) ) |step((((X+transpose(X,4) ) +transpose(X,7) ) +((arpeggio(X) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(arpeggio(transpose(shuffle(transpose(X,4) ) ,-7) ) ,-5) ,4) ) +transpose(transpose(transpose(((transpose(X,-7) |(X+transpose(X,12) ) ) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(X,4) ) ,-7) ,7) ) ,-5) ,4) ,7) ) |(((transpose(transpose((X+(X+X) ) ,4) ,4) +transpose((transpose(shuffle((transpose(X,-7) +X) ) ,-5) +transpose((transpose(transpose(transpose((X|X) ,4) ,-5) ,4) +transpose(step(transpose(X,-5) ,12) ,-5) ) ,7) ) ,12) ) +transpose(((transpose((X+X) ,4) |X) +transpose(transpose(((((X+transpose(X,12) ) |(X+transpose(X,12) ) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(X,7) ) ,-5) ,12) ) ,7) ) |((shuffle(transpose(transpose(X,-7) ,4) ) +(shuffle((transpose(X,-5) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) |(transpose(X,-7) |(shuffle(X) +((X+X) +transpose(shuffle(X) ,7) ) ) ) ) ) +echo(transpose(transpose((echo(X,4,6) |arpeggio(X) ) ,4) ,4) ,4,6) ) ) ) +transpose((step(((X+transpose(X,7) ) +transpose(X,4) ) ,12) +transpose((shuffle(X) |(shuffle(X) +echo(X,4,6) ) ) ,12) ) ,7) ) +transpose(arpeggio(transpose((transpose((arpeggio(arpeggio((transpose(X,-7) |shuffle(X) ) ) ) +transpose(arpeggio(shuffle(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,12) ) ,4) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,12) ) ,-7) ) ,12) ) ,4) ) ,7) ) random seed used was 68970162
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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